diff -r aaa68dce117e Lib/test/json_tests/test_decode.py
--- a/Lib/test/json_tests/test_decode.py	Thu Aug 09 21:38:23 2012 +0200
+++ b/Lib/test/json_tests/test_decode.py	Fri Aug 10 15:40:28 2012 +0530
@@ -54,6 +54,15 @@
         self.check_keys_reuse(s, self.loads)
         self.check_keys_reuse(s, self.json.decoder.JSONDecoder().decode)
 
+    def test_extra_data(self):
+        s = '[1, 2, 3]5'
+        msg = 'Extra data'
+        self.assertRaisesRegexp(ValueError, msg, self.loads, s)
+
+    def test_invalid_escape(self):
+        s = '["abc\\y"]'
+        msg = 'escape'
+        self.assertRaisesRegexp(ValueError, msg, self.loads, s)
 
 class TestPyDecode(TestDecode, PyTest): pass
 class TestCDecode(TestDecode, CTest): pass